On spying this selection of outstanding images gathered up by the hands of the Vippers, I must admit, I was at a loss – 佐々木 / Sasaki? A Haruhi character? And a boku-shoujo? From the novels I presumed – some research reveals her to be a Haruhi rival character, and a superior one at that.
In this gallery you can see more of her, and her alt-SOS-dan (周防九 / Kuyou Suou, with the long black hair, is in particular shaping up as the new Nagato it would seem), so please do convert.
If she is indeed Haruhi’s rival we can but hope for her crushing victory.